<h2>1.描述</h2>
<p>校验场景</p>
<h2>2.示例</h2>
<p>当前校验规则为：tiRequired</p>
1.模板驱动表单
<ti-cascader [items]="items" [(ngModel)]="mySelected" valueKey="label" [clearable]="true" tiValidation tiRequired></ti-cascader><br />
<span> 选中项： {{mySelected | json}} </span>
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2.响应式表单
<ti-cascader [items]="items" valueKey="label" [clearable]="true" tiValidation [formControl]="cascaderControl"></ti-cascader><br />
